GMAT 考满分题库

- 数学PS -
It is given that:y = x^2+ bx+ 4, which of the following values about “b” can make that equation have no intersection point with x-axis?
I. -2
II. 0
III. 4
  • AI
  • BII
  • CIIII
  • DI,II
  • EI,II,III
显示答案
正确答案: D

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